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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<a href="model-merge-reducer_8_c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// </span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">// </span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           </span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           </span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include &lt;iostream&gt;</span>
<a name="l00038"></a>00038 <span class="preprocessor">#include &lt;string&gt;</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &quot;../proto/dataio.h&quot;</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &quot;../utils/kdebug.h&quot;</span>
<a name="l00042"></a>00042 <span class="preprocessor">#include &quot;../proto/model.pb.h&quot;</span>
<a name="l00043"></a>00043 <span class="preprocessor">#include &quot;<a class="code" href="model-merge-reducer_8_h.html" title="Reducer classes for trainer.">model-merge-reducer.H</a>&quot;</span>
<a name="l00044"></a>00044 
<a name="l00045"></a>00045 <span class="keyword">namespace </span>reranker {
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 <span class="keyword">using namespace </span>std;
<a name="l00048"></a>00048 <span class="keyword">using</span> confusion_learning::FeatureMessage;
<a name="l00049"></a>00049 <span class="keyword">using</span> confusion_learning::ModelMessage;
<a name="l00050"></a>00050 
<a name="l00051"></a>00051 <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classreranker_1_1_model_info_reducer.html#a7a5e891fbc06d875a7ebbda81ac01c43">ModelInfoReducer::kModelMessageFeatureName</a> = <span class="stringliteral">&quot;__MODEL_INFO_FIELD__&quot;</span>;
<a name="l00052"></a>00052 
<a name="l00053"></a><a class="code" href="classreranker_1_1_feature_reducer.html#aadc39163e21196c3046a4ea2650fa931">00053</a> <a class="code" href="classreranker_1_1_feature_reducer.html#aadc39163e21196c3046a4ea2650fa931">FeatureReducer::FeatureReducer</a>(<span class="keywordtype">bool</span> uniform_mix, <span class="keywordtype">double</span> mix_denominator)
<a name="l00054"></a>00054    : num_merged_(0), uniform_mix_(uniform_mix),
<a name="l00055"></a>00055      mix_denominator_(mix_denominator) {
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057 
<a name="l00058"></a><a class="code" href="classreranker_1_1_feature_reducer.html#ab9da9eb4d0376a1af0d30f077824202b">00058</a> <span class="keywordtype">int</span> <a class="code" href="classreranker_1_1_feature_reducer.html#ab9da9eb4d0376a1af0d30f077824202b">FeatureReducer::Reduce</a>(<span class="keyword">const</span> <span class="keywordtype">string</span>&amp; feat_id, <span class="keyword">const</span> <span class="keywordtype">string</span>&amp; value) {
<a name="l00059"></a>00059   <span class="comment">// Decode the value as a FeatureMessage protocol buffer.</span>
<a name="l00060"></a>00060   FeatureMessage new_message;
<a name="l00061"></a>00061   <span class="keywordflow">if</span> (!messageio_.DecodeBase64(value, &amp;new_message)) {
<a name="l00062"></a>00062     cerr &lt;&lt; <span class="stringliteral">&quot;Error decoding message: &quot;</span> &lt;&lt; value.c_str() &lt;&lt; endl;
<a name="l00063"></a>00063   }
<a name="l00064"></a>00064   <span class="keywordtype">int</span> num_output = 0;
<a name="l00065"></a>00065   <span class="keywordflow">if</span> (feat_id.compare(prev_feat_) != 0) {
<a name="l00066"></a>00066     <span class="comment">// If this is a new feature (new key), then output the previous features.</span>
<a name="l00067"></a>00067     <span class="keywordflow">if</span> (!prev_feat_.empty()) {
<a name="l00068"></a>00068       <span class="comment">// Do we want to normalize the mixture with the number of mappers which</span>
<a name="l00069"></a>00069       <span class="comment">// found this feature ?</span>
<a name="l00070"></a>00070       <span class="keywordtype">double</span> normalizer = uniform_mix_ ? <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(num_merged_) :
<a name="l00071"></a>00071                           mix_denominator_;
<a name="l00072"></a>00072       <span class="keywordflow">if</span> (normalizer != 1.0) {
<a name="l00073"></a>00073         cur_message_.set_value(cur_message_.value() / normalizer);
<a name="l00074"></a>00074         cur_message_.set_avg_value(cur_message_.avg_value() / normalizer);
<a name="l00075"></a>00075       }
<a name="l00076"></a>00076       <span class="comment">// Encode message and output to stdout.</span>
<a name="l00077"></a>00077       <span class="keywordtype">string</span> encoded_msg;
<a name="l00078"></a>00078       messageio_.EncodeBase64(cur_message_, &amp;encoded_msg);
<a name="l00079"></a>00079       cout &lt;&lt; prev_feat_.c_str() &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; encoded_msg.c_str();
<a name="l00080"></a>00080     }
<a name="l00081"></a>00081     <span class="comment">// Record the new key and clear the state.</span>
<a name="l00082"></a>00082     prev_feat_ = feat_id;
<a name="l00083"></a>00083     cur_message_.CopyFrom(new_message);
<a name="l00084"></a>00084     num_merged_ = 1;
<a name="l00085"></a>00085     num_output = 1;
<a name="l00086"></a>00086   } <span class="keywordflow">else</span> {
<a name="l00087"></a>00087     cur_message_.set_value(cur_message_.value() + new_message.value());
<a name="l00088"></a>00088     cur_message_.set_avg_value(cur_message_.avg_value() + new_message.avg_value());
<a name="l00089"></a>00089     cur_message_.set_count(cur_message_.count() + new_message.count());
<a name="l00090"></a>00090     num_merged_++;
<a name="l00091"></a>00091   }
<a name="l00092"></a>00092   <span class="comment">// Update state.</span>
<a name="l00093"></a>00093   <span class="keywordflow">return</span> num_output;
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095 
<a name="l00096"></a><a class="code" href="classreranker_1_1_feature_reducer.html#a0c995100fd74abc0bd19264a409c2a2b">00096</a> <span class="keywordtype">int</span> <a class="code" href="classreranker_1_1_feature_reducer.html#a0c995100fd74abc0bd19264a409c2a2b">FeatureReducer::Flush</a>(<span class="keywordtype">void</span>) {
<a name="l00097"></a>00097   <span class="keywordflow">if</span> (!prev_feat_.empty()) {
<a name="l00098"></a>00098       <span class="keywordtype">double</span> normalizer = uniform_mix_ ? <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(num_merged_) :
<a name="l00099"></a>00099                           mix_denominator_;
<a name="l00100"></a>00100       <span class="keywordflow">if</span> (normalizer != 1.0) {
<a name="l00101"></a>00101         cur_message_.set_value(cur_message_.value() / normalizer);
<a name="l00102"></a>00102         cur_message_.set_avg_value(cur_message_.avg_value() / normalizer);
<a name="l00103"></a>00103       }
<a name="l00104"></a>00104     <span class="keywordtype">string</span> encoded_msg;
<a name="l00105"></a>00105     messageio_.EncodeBase64(cur_message_, &amp;encoded_msg);
<a name="l00106"></a>00106     cout &lt;&lt; prev_feat_.c_str() &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; encoded_msg.c_str();
<a name="l00107"></a>00107     prev_feat_.clear();
<a name="l00108"></a>00108     cur_message_.Clear();
<a name="l00109"></a>00109     num_merged_ = 0;
<a name="l00110"></a>00110     <span class="keywordflow">return</span> 1;
<a name="l00111"></a>00111   }
<a name="l00112"></a>00112   <span class="keywordflow">return</span> 0;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 
<a name="l00115"></a><a class="code" href="classreranker_1_1_model_info_reducer.html#a123c002d8d75f062323538294030d853">00115</a> <span class="keywordtype">int</span> <a class="code" href="classreranker_1_1_model_info_reducer.html#a123c002d8d75f062323538294030d853">ModelInfoReducer::Reduce</a>(<span class="keyword">const</span> <span class="keywordtype">string</span>&amp; key, <span class="keyword">const</span> <span class="keywordtype">string</span>&amp; value) {
<a name="l00116"></a>00116   ModelMessage new_message;
<a name="l00117"></a>00117   <span class="keywordflow">if</span> (!messageio_.DecodeBase64(value, &amp;new_message)) {
<a name="l00118"></a>00118     cerr &lt;&lt; <span class="stringliteral">&quot;Error decoding message: &quot;</span> &lt;&lt; value.c_str() &lt;&lt; endl;
<a name="l00119"></a>00119   }
<a name="l00120"></a>00120   <span class="keywordflow">if</span> (new_model_message_) {
<a name="l00121"></a>00121     model_message_.CopyFrom(new_message);
<a name="l00122"></a>00122     new_model_message_ = <span class="keyword">false</span>;
<a name="l00123"></a>00123     <span class="keywordflow">if</span> (model_message_.has_symbols()) {
<a name="l00124"></a>00124       model_message_.clear_symbols();
<a name="l00125"></a>00125     }
<a name="l00126"></a>00126   } <span class="keywordflow">else</span> {
<a name="l00127"></a>00127     model_message_.set_loss(model_message_.loss() + new_message.loss());
<a name="l00128"></a>00128     model_message_.set_training_errors(
<a name="l00129"></a>00129         model_message_.training_errors() + new_message.training_errors());
<a name="l00130"></a>00130     <span class="keywordflow">if</span> (model_message_.reader_spec().compare(new_message.reader_spec()) != 0) {
<a name="l00131"></a>00131       cerr &lt;&lt; <span class="stringliteral">&quot;Combining messages with different reader_spec fields.&quot;</span>;
<a name="l00132"></a>00132       <span class="keywordflow">return</span> -1;
<a name="l00133"></a>00133     }
<a name="l00134"></a>00134     <span class="comment">// Check that the models being merged have the same specs.</span>
<a name="l00135"></a>00135     <span class="keywordflow">if</span> (model_message_.model_spec().compare(new_message.model_spec()) != 0) {
<a name="l00136"></a>00136       cerr &lt;&lt; <span class="stringliteral">&quot;Combining messages with different model_spec fields.&quot;</span>;
<a name="l00137"></a>00137       <span class="keywordflow">return</span> -1;
<a name="l00138"></a>00138     }
<a name="l00139"></a>00139     <span class="keywordflow">if</span> (model_message_.identifier().compare(new_message.identifier()) != 0) {
<a name="l00140"></a>00140       cerr &lt;&lt; <span class="stringliteral">&quot;Combining messages with different identifier fields.&quot;</span>;
<a name="l00141"></a>00141       <span class="keywordflow">return</span> -1;
<a name="l00142"></a>00142     }
<a name="l00143"></a>00143     <span class="keywordflow">if</span> (model_message_.num_iterations() != new_message.num_iterations()) {
<a name="l00144"></a>00144       cerr &lt;&lt; <span class="stringliteral">&quot;Combining messages with different num_iterations fields.&quot;</span>;
<a name="l00145"></a>00145       <span class="keywordflow">return</span> -1;
<a name="l00146"></a>00146     }
<a name="l00147"></a>00147     <span class="keywordflow">if</span> (model_message_.has_symbols()) {
<a name="l00148"></a>00148       <span class="keywordflow">if</span> (new_message.has_symbols()) {
<a name="l00149"></a>00149         <span class="comment">// Do something sensible to merge symbols ???</span>
<a name="l00150"></a>00150         <span class="comment">// Or assume they are the same.</span>
<a name="l00151"></a>00151         <span class="comment">// TODO(kbhall): resolve this symbols problem.</span>
<a name="l00152"></a>00152       }
<a name="l00153"></a>00153     }
<a name="l00154"></a>00154   }
<a name="l00155"></a>00155   <span class="keywordflow">return</span> 0;
<a name="l00156"></a>00156 }
<a name="l00157"></a>00157 
<a name="l00158"></a><a class="code" href="classreranker_1_1_model_info_reducer.html#a5e8922b1c5caca6cbbe2224a4cf76821">00158</a> <span class="keywordtype">int</span> <a class="code" href="classreranker_1_1_model_info_reducer.html#a5e8922b1c5caca6cbbe2224a4cf76821">ModelInfoReducer::Flush</a>(<span class="keywordtype">void</span>) {
<a name="l00159"></a>00159   <span class="keywordflow">if</span> (new_model_message_) {
<a name="l00160"></a>00160     <span class="keywordflow">return</span> 0;
<a name="l00161"></a>00161   }
<a name="l00162"></a>00162   <span class="keywordflow">if</span> (!model_message_.has_num_iterations()) {
<a name="l00163"></a>00163     cerr &lt;&lt; <span class="stringliteral">&quot;No model information&quot;</span>;
<a name="l00164"></a>00164     <span class="keywordflow">return</span> -1;
<a name="l00165"></a>00165   }
<a name="l00166"></a>00166   model_message_.set_num_iterations(model_message_.num_iterations() + 1);
<a name="l00167"></a>00167   <span class="keywordtype">string</span> encoded_msg;
<a name="l00168"></a>00168   messageio_.EncodeBase64(model_message_, &amp;encoded_msg);
<a name="l00169"></a>00169   cout &lt;&lt; <a class="code" href="classreranker_1_1_model_info_reducer.html#a7a5e891fbc06d875a7ebbda81ac01c43">ModelInfoReducer::kModelMessageFeatureName</a>;
<a name="l00170"></a>00170   cout &lt;&lt; <span class="stringliteral">&quot;\t&quot;</span> &lt;&lt; encoded_msg.c_str();
<a name="l00171"></a>00171   model_message_.Clear();
<a name="l00172"></a>00172   <span class="keywordflow">return</span> 1;
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174 
<a name="l00175"></a><a class="code" href="classreranker_1_1_symbol_reducer.html#a0b83f7605c7000eb3d4cbcaab193c69b">00175</a> <span class="keywordtype">int</span> <a class="code" href="classreranker_1_1_symbol_reducer.html#a0b83f7605c7000eb3d4cbcaab193c69b">SymbolReducer::Reduce</a>(<span class="keyword">const</span> <span class="keywordtype">string</span>&amp; key, <span class="keyword">const</span> <span class="keywordtype">string</span>&amp; value) {
<a name="l00176"></a>00176   <span class="keywordflow">if</span> (key.compare(prev_sym_) != 0) {
<a name="l00177"></a>00177     cout &lt;&lt; key.c_str() &lt;&lt; endl;
<a name="l00178"></a>00178     prev_sym_ = key;
<a name="l00179"></a>00179     <span class="keywordflow">return</span> 1;
<a name="l00180"></a>00180   }
<a name="l00181"></a>00181   <span class="keywordflow">return</span> 0;
<a name="l00182"></a>00182 }
<a name="l00183"></a>00183 
<a name="l00184"></a>00184 }  <span class="comment">// End of namespace.</span>
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</a> 1.7.6.1
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